Dielectric Slab Directional Coupler for Ultra-Wideband Low-Loss THz Links
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Solution Overview
Problem
Current multi-port directional couplers are frequency limited and suffer from significant insertion and coupling losses, limiting their bandwidth and increasing manufacturing costs.
Innovation Solution
A multi-port directional coupler design utilizing dielectric slabs with adjustable permittivity and optional rods, configured to achieve ultra-wideband communication capabilities with reduced losses and simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional multi-port directional couplers are used, then they can perform signal sampling and monitoring, but they are frequency limited and suffer from significant insertion and coupling losses
Solution Approach 1:
The patent changes the fundamental operating parameters by using dielectric slab waveguides instead of conventional metallic waveguides or transmission lines. This material parameter change enables ultra-wideband operation from 6 GHz to over 100 GHz while reducing insertion and coupling losses through the low-loss dielectric material properties.
Solution Approach 2:
The invention employs composite dielectric slab structures with specific permittivity values to achieve both wide bandwidth and low losses. The dielectric slabs are positioned at specific heights above the ground plane, creating a composite structure that supports multiple propagation modes across a broad frequency range while maintaining low insertion and coupling losses.
2Adaptability or versatility
If conventional multi-port directional couplers are used, then they can perform signal sampling and monitoring, but their bandwidth is limited
Solution Approach 1:
The directional coupler is segmented into four distinct ports (input, output, coupled, and isolated) with dielectric slabs positioned at different heights above the ground plane. This segmentation allows independent optimization of each port's characteristics while achieving ultra-wideband operation through the collective interaction of all segments.
Solution Approach 2:
The patent introduces a vertical dimension by positioning dielectric slabs at different heights (z-coordinates) above the ground plane. This three-dimensional configuration enables the coupler to support multiple propagation modes across a broad frequency range, achieving ultra-wideband operation without increasing planar footprint or overall device complexity.
3Adaptability or versatility
If dielectric slabs are used to achieve ultra-wideband operation, then bandwidth is improved, but manufacturing precision requirements increase
Solution Approach 1:
The dielectric slab structure serves multiple functions simultaneously: it acts as the waveguide medium, provides signal coupling, defines port characteristics, and enables ultra-wideband operation. This multi-functionality reduces the need for additional components and simplifies manufacturing by consolidating multiple requirements into a single structural element.
Solution Approach 2:
The patent optimizes the dielectric constant values and slab heights to achieve a balance between ultra-wideband performance and manufacturing feasibility. By carefully selecting dielectric materials with appropriate permittivity values and positioning slabs at optimized heights, the design achieves frequency ranges from 6 GHz to over 100 GHz while maintaining reasonable manufacturing precision requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design provides ultra-wideband operation up to 400 GHz, reduced insertion and coupling losses, and cost-effective manufacturing, enhancing performance and efficiency in broadband communication applications.
Implementation Method 1
a first dielectric slab and a second dielectric slab, wherein the first dielectric slab and the second dielectric slab are arranged adjacently in a first plane
Implementation Method 2
a half-mirror, wherein said half-mirror can comprise a first dielectric slab and a second dielectric slab... the first dielectric slab and the second dielectric slab each can comprise at least one port
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
The invention relates to a multi-port directional coupler (100) for broadband communication applications, comprising: a half-mirror (110), comprising: a first dielectric slab (101) and a second dielectric slab (102); wherein the first dielectric slab (101) and the second dielectric slab (102) are arranged adjacently in a first plane, and wherein the first dielectric slab (101) and the second dielectric slab (102) each comprise at least one port.